I happen to be trading in a fair bit of Fleur de Sel from Guérande, and can assure you that any difference between Portugal and our product can only be either c

I happen to be trading in a fair bit of Fleur de Sel from Guérande, and can assure you that any difference between Portugal and our product can only be either chance, or almost deliberate efforts to sabotage the Portuguese product. They both start with the same "raw material": water of the Northern Atlantic, which I would think is mixed enough not be significantly different in these two locations. Guérande is probably one of the largest locations for sea salt, but the processes are far away from industrial scale. They manually remove contamination that they see, but I've found a few fish in the salt. Contamination at the millimetre-scale is tested for, but there are no filtration processes in place to reduce them.